Unfortunately, there is nothing that you can do to make him be a father any more that you can make him be a husband. Even with a visitation order, it's up to him to comply. His relationship with the kids is his responsibilty, not yours.
Be truthful with your girls. Don't bad mouth him but don't lie or cover up for him either. They need to know that his choices are his decision. Belive me, when they tell him off for not showing up or refuse a phone call to get back at him, that will get his attention.
